From the back of the book:
The INDIE RPG scene is a diverse, fascinating, and vibrant part of the RPG community. 9th Level Games has brought together a few samples of the vast INDIE RPG scene for FREE RPG DAY 2020, and hopes that this anthology will be the first of many volumes to come. Some of the games inside are silly, and some are serious. Some can be played solo, and others are great for large groups. Some use dice, and others don't. What they all have in common is a unique and interesting take on the hobby that we all love -- Role Playing!
Volume 2 was released for FreeRPG day 2021.